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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce0e34c4e7c3563b93a9588114256ebe2bcbba5daa797723b041a408b52113d' 
  AND token = 'GvENHp+hxu4Jiqn6j3Gzrz2Rdy1eej5mhiG4oMINOOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}